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AT42QT1011 Datasheet(PDF) 9 Page - ATMEL Corporation

Part No. AT42QT1011
Description  One-channel Touch Sensor IC
Download  18 Pages
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Manufacturer  ATMEL [ATMEL Corporation]
Direct Link  http://www.atmel.com
Logo ATMEL - ATMEL Corporation

AT42QT1011 Datasheet(HTML) 9 Page - ATMEL Corporation

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9
9542G–AT42–03/10
AT42QT1011
Figure 3-6.
Obtaining HeartBeat Pulses with a Pull-up Resistor
If the sensor is wired to a microcontroller as shown in Figure 3-7 on page 9, the microcontroller
can reconfigure the load resistor to either Vss or Vdd depending on the output state of the
QT1011, so that the pulses are evident in either state.
Figure 3-7.
Using a Microcontroller to Obtain HeartBeat Pulses in Either Output State
Electromechanical devices like relays will usually ignore the short HeartBeat pulse. The pulse
also has too low a duty cycle to visibly affect LEDs. It can be filtered completely if desired, by
adding an RC filter to the output, or if interfacing directly and only to a high-impedance CMOS
input, by doing nothing or at most adding a small noncritical capacitor from OUT to Vss.
3.9.3
Output Drive
The OUT pin is active high and can sink or source up to 2 mA. When a large value of Cs
(>20 nF) is used the OUT current should be limited to <1 mA to prevent gain-shifting side
effects, which happen when the load current creates voltage drops on the die and bonding
wires; these small shifts can materially influence the signal level to cause detection instability.
6
4
5
VDD
3
1
OUT
SNS
SYNC
SNSK
VSS
VDD
2
Ro
HeartBeat™Pulses
Microcontroller
PORT_M.x
PORT_M.y
6
4
3
1
OUT
SNS
SYNC
SNSK
Ro


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